add support for calls to a hotplug script on interface state changes
[project/netifd.git] / interface.c
index f08fee0..3820050 100644 (file)
@@ -5,11 +5,12 @@
 #include "netifd.h"
 #include "device.h"
 #include "interface.h"
+#include "interface-ip.h"
 #include "proto.h"
 #include "ubus.h"
 #include "config.h"
 
-static LIST_HEAD(interfaces);
+struct vlist_tree interfaces;
 
 enum {
        IFACE_ATTR_IFNAME,
@@ -18,10 +19,6 @@ enum {
        IFACE_ATTR_MAX
 };
 
-static const union config_param_info iface_attr_info[IFACE_ATTR_MAX] = {
-       [IFACE_ATTR_IFNAME].type = BLOBMSG_TYPE_STRING,
-};
-
 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
        [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
        [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
@@ -31,11 +28,10 @@ static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
 const struct config_param_list interface_attr_list = {
        .n_params = IFACE_ATTR_MAX,
        .params = iface_attrs,
-       .info = iface_attr_info,
 };
 
 static void
-clear_interface_errors(struct interface *iface)
+interface_clear_errors(struct interface *iface)
 {
        struct interface_error *error, *tmp;
 
@@ -82,14 +78,16 @@ void interface_add_error(struct interface *iface, const char *subsystem,
 static void
 interface_event(struct interface *iface, enum interface_event ev)
 {
-       /* TODO */
+       interface_queue_event(iface, ev);
 }
 
 static void
 mark_interface_down(struct interface *iface)
 {
-       interface_del_ctx_addr(iface, NULL);
-       device_release(iface->main_dev.dev);
+       vlist_flush_all(&iface->proto_addr);
+       vlist_flush_all(&iface->proto_route);
+       if (iface->main_dev.dev)
+               device_release(&iface->main_dev);
        iface->state = IFS_DOWN;
 }
 
@@ -101,9 +99,11 @@ __interface_set_up(struct interface *iface)
        if (iface->state != IFS_DOWN)
                return 0;
 
-       ret = device_claim(iface->main_dev.dev);
-       if (ret)
-               return ret;
+       if (iface->main_dev.dev) {
+               ret = device_claim(&iface->main_dev);
+               if (ret)
+                       return ret;
+       }
 
        iface->state = IFS_SETUP;
        ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
@@ -119,7 +119,7 @@ __interface_set_up(struct interface *iface)
 static void
 __interface_set_down(struct interface *iface, bool force)
 {
-       clear_interface_errors(iface);
+       interface_clear_errors(iface);
 
        if (iface->state == IFS_DOWN ||
                iface->state == IFS_TEARDOWN)
@@ -127,8 +127,6 @@ __interface_set_down(struct interface *iface, bool force)
 
        iface->state = IFS_TEARDOWN;
        interface_event(iface, IFEV_DOWN);
-
-       interface_del_all_routes(iface);
        interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 }
 
@@ -150,10 +148,17 @@ interface_cb(struct device_user *dep, enum device_event ev)
                return;
        }
 
-       if (iface->active == new_state)
+       interface_set_available(iface, new_state);
+}
+
+void
+interface_set_available(struct interface *iface, bool new_state)
+{
+       if (iface->available == new_state)
                return;
 
-       iface->active = new_state;
+       D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
+       iface->available = new_state;
 
        if (new_state) {
                if (iface->autostart && !config_init)
@@ -163,6 +168,66 @@ interface_cb(struct device_user *dep, enum device_event ev)
 }
 
 static void
+interface_claim_device(struct interface *iface)
+{
+       struct device *dev;
+
+       if (iface->proto_handler &&
+               !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
+               dev = device_get(iface->ifname, true);
+               if (dev)
+                       device_add_user(&iface->main_dev, dev);
+       }
+}
+
+
+static void
+interface_cleanup(struct interface *iface)
+{
+       interface_clear_errors(iface);
+       if (iface->main_dev.dev)
+               device_remove_user(&iface->main_dev);
+       interface_set_proto_state(iface, NULL);
+}
+
+static void
+interface_do_free(struct interface *iface)
+{
+       interface_cleanup(iface);
+       free(iface->config);
+       netifd_ubus_remove_interface(iface);
+       avl_delete(&interfaces.avl, &iface->node.avl);
+       free(iface);
+}
+
+static void
+interface_do_reload(struct interface *iface)
+{
+       interface_cleanup(iface);
+
+       interface_claim_device(iface);
+       proto_init_interface(iface, iface->config);
+
+       if (iface->autostart && !config_init)
+               interface_set_up(iface);
+}
+
+static void
+interface_handle_config_change(struct interface *iface)
+{
+       switch(iface->config_state) {
+       case IFC_NORMAL:
+               break;
+       case IFC_RELOAD:
+               interface_do_reload(iface);
+               break;
+       case IFC_REMOVE:
+               interface_do_free(iface);
+               break;
+       }
+}
+
+static void
 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 {
        struct interface *iface = state->iface;
@@ -180,6 +245,14 @@ interface_proto_cb(struct interface_proto_state *state, enum interface_proto_eve
                        return;
 
                mark_interface_down(iface);
+               interface_handle_config_change(iface);
+               break;
+       case IFPEV_LINK_LOST:
+               if (iface->state != IFS_UP)
+                       return;
+
+               iface->state = IFS_SETUP;
+               interface_event(iface, IFEV_DOWN);
                break;
        }
 }
@@ -187,7 +260,6 @@ interface_proto_cb(struct interface_proto_state *state, enum interface_proto_eve
 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 {
        if (iface->proto) {
-               interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
                iface->proto->free(iface->proto);
                iface->proto = NULL;
        }
@@ -200,67 +272,50 @@ void interface_set_proto_state(struct interface *iface, struct interface_proto_s
        state->iface = iface;
 }
 
-struct interface *
-interface_alloc(const char *name, struct blob_attr *attr)
+void
+interface_init(struct interface *iface, const char *name,
+              struct blob_attr *config)
 {
-       struct interface *iface;
        struct blob_attr *tb[IFACE_ATTR_MAX];
        struct blob_attr *cur;
-       struct device *dev;
        const char *proto_name = NULL;
 
-       iface = interface_get(name);
-       if (iface)
-               return iface;
-
-       iface = calloc(1, sizeof(*iface));
-       iface->main_dev.cb = interface_cb;
-       iface->l3_iface = &iface->main_dev;
        strncpy(iface->name, name, sizeof(iface->name) - 1);
-       list_add_tail(&iface->list, &interfaces);
        INIT_LIST_HEAD(&iface->errors);
-       INIT_LIST_HEAD(&iface->address);
-       INIT_LIST_HEAD(&iface->routes);
+       INIT_LIST_HEAD(&iface->hotplug_list);
+
+       iface->main_dev.cb = interface_cb;
+       iface->l3_dev = &iface->main_dev;
 
        blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
-                     blob_data(attr), blob_len(attr));
+                     blob_data(config), blob_len(config));
 
        if ((cur = tb[IFACE_ATTR_PROTO]))
                proto_name = blobmsg_data(cur);
 
        proto_attach_interface(iface, proto_name);
 
-       if ((cur = tb[IFACE_ATTR_IFNAME])) {
-               dev = device_get(blobmsg_data(cur), true);
-               if (dev)
-                       device_add_user(&iface->main_dev, dev);
-       }
-
-       netifd_ubus_add_interface(iface);
-
-       return iface;
+       if ((cur = tb[IFACE_ATTR_AUTO]))
+               iface->autostart = blobmsg_get_bool(cur);
+       else
+               iface->autostart = true;
+       iface->config_autostart = iface->autostart;
 }
 
 void
-interface_free(struct interface *iface)
+interface_add(struct interface *iface, struct blob_attr *config)
 {
-       netifd_ubus_remove_interface(iface);
-       list_del(&iface->list);
-       if (iface->proto->free)
-               iface->proto->free(iface->proto);
-       free(iface);
-}
+       struct blob_attr *tb[IFACE_ATTR_MAX];
+       struct blob_attr *cur;
 
-struct interface *
-interface_get(const char *name)
-{
-       struct interface *iface;
+       blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
+                     blob_data(config), blob_len(config));
 
-       list_for_each_entry(iface, &interfaces, list) {
-               if (!strcmp(iface->name, name))
-                       return iface;
-       }
-       return NULL;
+       if ((cur = tb[IFACE_ATTR_IFNAME]))
+               iface->ifname = blobmsg_data(cur);
+
+       iface->config = config;
+       vlist_add(&interfaces, &iface->node);
 }
 
 void
@@ -297,7 +352,7 @@ interface_set_up(struct interface *iface)
 {
        iface->autostart = true;
 
-       if (!iface->active) {
+       if (!iface->available) {
                interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
                return -1;
        }
@@ -311,8 +366,13 @@ interface_set_up(struct interface *iface)
 int
 interface_set_down(struct interface *iface)
 {
-       iface->autostart = false;
-       __interface_set_down(iface, false);
+       if (!iface) {
+               vlist_for_each_element(&interfaces, iface, node)
+                       __interface_set_down(iface, false);
+       } else {
+               iface->autostart = false;
+               __interface_set_down(iface, false);
+       }
 
        return 0;
 }
@@ -322,8 +382,92 @@ interface_start_pending(void)
 {
        struct interface *iface;
 
-       list_for_each_entry(iface, &interfaces, list) {
-               if (iface->active && iface->autostart)
+       vlist_for_each_element(&interfaces, iface, node) {
+               if (iface->available && iface->autostart)
                        interface_set_up(iface);
        }
 }
+
+static void
+set_config_state(struct interface *iface, enum interface_config_state s)
+{
+       iface->config_state = s;
+       if (iface->state == IFS_DOWN)
+               interface_handle_config_change(iface);
+       else
+               __interface_set_down(iface, false);
+}
+
+static void
+interface_change_config(struct interface *if_old, struct interface *if_new)
+{
+       struct blob_attr *old_config = if_old->config;
+       const char *old_ifname = if_old->ifname;
+       const struct proto_handler *proto = if_old->proto_handler;
+
+       interface_clear_errors(if_old);
+       if_old->config = if_new->config;
+       if (!if_old->config_autostart && if_new->config_autostart)
+               if_old->autostart = true;
+
+       if_old->config_autostart = if_new->config_autostart;
+       if_old->ifname = if_new->ifname;
+       if_old->proto_handler = if_new->proto_handler;
+
+       if (strcmp(old_ifname, if_new->ifname) != 0 ||
+               proto != if_new->proto_handler) {
+               D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
+                 if_old->name);
+               goto reload;
+       }
+
+       if (!proto->config_params)
+               D(INTERFACE, "No config parameters for interface '%s'\n",
+                 if_old->name);
+       else if (!config_check_equal(old_config, if_new->config,
+                               proto->config_params)) {
+               D(INTERFACE, "Reload interface '%s because of config changes\n",
+                 if_old->name);
+               goto reload;
+       }
+
+       goto out;
+
+reload:
+       set_config_state(if_old, IFC_RELOAD);
+out:
+       free(old_config);
+       free(if_new);
+}
+
+static void
+interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
+                struct vlist_node *node_old)
+{
+       struct interface *if_old = container_of(node_old, struct interface, node);
+       struct interface *if_new = container_of(node_new, struct interface, node);
+
+       if (node_old && node_new) {
+               D(INTERFACE, "Update interface '%s'\n", if_new->name);
+               interface_change_config(if_old, if_new);
+       } else if (node_old) {
+               D(INTERFACE, "Remove interface '%s'\n", if_old->name);
+               set_config_state(if_old, IFC_REMOVE);
+       } else if (node_new) {
+               D(INTERFACE, "Create interface '%s'\n", if_new->name);
+               interface_claim_device(if_new);
+               proto_init_interface(if_new, if_new->config);
+               interface_ip_init(if_new);
+               netifd_ubus_add_interface(if_new);
+       }
+}
+
+
+static void __init
+interface_init_list(void)
+{
+       vlist_init(&interfaces, avl_strcmp, interface_update,
+                  struct interface, node, name);
+       interfaces.keep_old = true;
+       interfaces.no_delete = true;
+}